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_load_textdomain_just_in_time() WP 4.6.0

Loads plugin and theme textdomains just-in-time.

When a textdomain is encountered for the first time, we try to load the translation file from wp-content/languages, removing the need to call load_plugin_texdomain() or load_theme_texdomain().

  • See: get_translations_for_domain()
  • Global. MO[]. $l10n_unloaded An array of all text domains that have been unloaded again.

No Hooks.


true/false. True when the textdomain is successfully loaded, false otherwise.


_load_textdomain_just_in_time( $domain );
$domain(string) (required)
Text domain. Unique identifier for retrieving translated strings.

Code of load textdomain just in time: wp-includes/l10n.php WP 5.2.2

function _load_textdomain_just_in_time( $domain ) {
	global $l10n_unloaded;

	$l10n_unloaded = (array) $l10n_unloaded;

	// Short-circuit if domain is 'default' which is reserved for core.
	if ( 'default' === $domain || isset( $l10n_unloaded[ $domain ] ) ) {
		return false;

	$translation_path = _get_path_to_translation( $domain );
	if ( false === $translation_path ) {
		return false;

	return load_textdomain( $domain, $translation_path );